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Monthly averaged atmospheric conditions in transition flow region in 40°N of China

WANG Hongbing;LIU Jianwen;LUO Jie;MA Qiang;SHU Xiaocun;College of Meteorology and Oceanography,PLA Univ.of Sci.& Tech.;Air Force Academy of Equipment;  
To research the monthly averaged atmospheric conditions in the transition flow region in 40°N of China.The thermosphere ionosphere mesosphere energetics and dynamies(TIMED)/sounding of the atmosphere using broadband emission radiometry(SABER)data were used for the first time in this paper.The data of temperatures and densities in Beijing and Jiuquan between 2003-2014 were selected.The spectral analysis method of Lomb-Scargle was used to extract the periodicity features.Results show that conditions in the transition flow region has a very little change along the longitude.Spectral analysis indicate that the temperatures in the transition flow region have a notable 4-month period as well as a one-year period,and a further analysis indicates that the 4-month period shows the same phase in the bottom of the region as well as in the upper region,and a anti-phase in the middle layer.The densities have a half-year period and a one-year period.Both periods exist above 90 km and only the one-year period is obvious below 90 km.An external forcing on temperature and density from solar activity exists in the upper transition flow region,and this external forcing varies with month.
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